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Try these suggestions
1. Change needle
2. Rethread the machine--top --make sure to use every thread guide
3. Take the bobbin out --make sure it is inserted correctly into the bobbin
Case, & make sure the bobbin is turned the correct way
4. make sure the thread has not come off the thread take up lever
5. Clean under the needle plate & in the bobbin area for lint or threads

Put the tension back up to about 5. Rethread the machine entirely, and make sure you have the pressure foot in the up position when you rethread. If your getting bunching on the bottom, it's probably your top thread that's bunching up. After you rethread, put a small piece of fabric under the pressure foot, lower the pressure foot, and turn the handwheel in the forward direction and watch the thread as it comes around the bobbin case. If it goes around smoothly, try it with the foot control. If it hangs up as it goes around the bobbin case, you might have a burr on the black plastic bobbin case. Take it out, check for any burrs, sand them down, and try again.

It is in your top threading, try this test, rethread, now with the presser foot up, pull the top thread, it should feed smoothly, now lower the presser foot, it should barely move. Sometimes this seats the thread in the tension discs. Also, make sure that your needle is fresh.

"Birdnesting" occurs when there is no tension on the needle thread to pull the bobbin thread. This is easily corrected by rethreading the machine, following the threading path carefully and making sure the thread is fully engaged in the tension mechanism.

When I have run into similar problems with my older Singer, it's because there is a bit of thread caught somewhere in the bobbin mechanism that doesn't allow the shuttle to run freely. Take the bobbin assembly apart and use a bright light to see if you see any bits of thread in there.

I had the same problem and I tried everything including removing the bobin case, cleaning out lint, changing the needle, adjusting the tension but it did not work. Then I finally tried reloading the bobin thread, making sure to load the bobin according the manual directions....and the problem was solved...no more tangles... just a nice even stitch...yeah!